Sound-absorbing board

Abstract

As shown in the reference diagram, this product is an indoor sound-absorbing board comprising a peripheral wall and a perforated plate, with a rear air layer defined by the peripheral wall and the perforated plate. The peripheral wall is positioned in the front, up / down, and left / right directions relative to the perforated plate. The rear air layer is defined by closing the opening in the peripheral wall with the perforated plate. The holes formed in the perforated plate are entry and exit points for sound to and from the rear air layer. The parts for which registration is sought are the left / right peripheral wall and the perforated plate (excluding the holes), and because the perforated plate is curved, multiple different resonance frequencies are set for each region where the depth (thickness) of the rear air layer is steplessly non-uniform, thus having a function and use that enhances the sound absorption effect.

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